Coating of ship screw-shafts



UNITED STATES PATENT OFFICE.

AUGUST FREESE, OF DAN ZIG, GERMANY, ASSIGNOR TO SQCIETY FREESES PATENT EISENSCHUTZ UNI) SCHRAUBENWELLENBEKLEIDUNG FUR SCHIFFE G. M. B. 11,

OF GHABLOTTENBURG, GERMANY.

COATING OF SHIP SCREW-SHAFTS.

No Drawing.

To all 20 7mm it may concern:

Be it known that I, AUGUsr FREESE, a citizen of the German Republic, and resident of Danzig, Germany, have invented certain new and useful Improvements in Coating of Ship Screw-Shafts, (for which I have filed applications in Germany, May 1, 1917 Spain, Dec. 13, 1919; Denmark, Dec. 12, 1919; Sweden, Dec. 19, 1919; Norway, Dec. 20, 1919; Switzerland, Mar. 17, 1919,) of which the following is a specification.

The invention concerns a succedaneum for the expensive rubber lining used until now for coating the screw shafts of ships.

The succedaneum is composed of four to five parts of minium or red lead and one part of wood tar and is applied upon the shaft to a thickness of about half a millimeter by means of a trowel, after thoroughly Specification of Letters Patent.

Application filed January 6, 1921.

Patented July 26', 1921.

Serial No. 435,548.

cleaning and drying the shaft. This coating should dry for about two or three hours, after which the shaft may be dipped into water.

The above mixture forms, as experience has proved, a particularly good protection against the formation of rust on iron.

Having now fully described my said invention, what I claim and desire to secure by Letters Patent, is:

A coating for ship screw shafts comprising a mixture of four to five parts of minium or red lead and one part of wood tar.

In testimony whereof I have hereunto set my hand in presence of two witnesses.

AUGUST FREESE.

Witnesses:

ALBERT HALs'rEAD, J12, WVALTER DEMSKI. 

